Dissomphalus gionus Mugrabi & Azevedo

MUGRABI, DANIELE F. & AZEVEDO, CELSO O., 2013, Revision of Thai Dissomphalus Ashmead, 1893 (Hymenoptera, Bethylidae), with description of twenty four new species, Zootaxa 3662 (1), pp. 1-73 : 33-35

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https://doi.org/ 10.11646/zootaxa.3662.1.1

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Dissomphalus gionus Mugrabi & Azevedo

sp. nov.

Dissomphalus gionus Mugrabi & Azevedo , sp. nov.

( Figs 41–44, 108, 171–174)

Description. MALE. Body length 2.24 mm. LFW 2.16 mm. Maximum wing width 0.76 mm. Color. Head and mesosoma black; metasoma dark castaneous with castaneous spots.

Head. Mandible with three apical teeth. Clypeus with median lobe ill-defined; with one tooth, median tooth rounded; median carina absent. Ratio of first four antennal segments about 12:5:5:4. Frons weakly coriaceous, punctures large. LH 1 × WH, WF 0.58 × WH, WF 1.31 × HE, OOL 1.2 × WOT, DAO 0.4 × WOT, posterior ocelli distant from vertex crest 0.5 × DAO, frontal angle of ocellar triangle right, VOL 0.81 × HE. Vertex crest strongly convex. Occipital carina visible in dorsal view.

Mesosoma. Pronotal disc weakly coriaceous, anterior margin carinate. Notauli deep, incomplete, not reaching posterior margin of mesoscutum, evenly wide, converging posterad. Propodeal disc 0.91 × as long as wide; basal triangle rugulose, posterolateral area rugulose; median carina posteriorly incomplete; lateral margins weakly convex, converging posterad; posterior carina well-defined, convex. Lateral of propodeum mostly imbricate. Propodeal declivity mostly rugulose.

Metasoma. Tergal process with deep, circular and sublateral pair of depressions; depressions 0.75 × as long as tergite II, diverging posterad, distant each other 0.9 × maximum transverse diameter, with setae short and dorsad; very small pair of tubercles placed on laterointernal area of depression, conical in longitudinal section, high, with small pit on top with few setae very short and laterad ( Figs 41–44). Hypopygium with median stalk 0.95 × as long as hypopygeal plate; median stalk wide; corner of anterior margin angular; lateral stalk of hypopygium 0.33 × as long as median stalk; posterior margin weakly concave; corner rounded (Fig. 108).

Genitalia ( Figs 171–174). Genital ring slightly produced, each half straight in dorsal view. Basiparamere with dorsal surface much wider apicad, much narrower than ventral surface. Paramere with basal area as wide as basiparamere apex, ventral margin deeply excavated forming a dorsad projection with apex angulate; apical margin strongly convex in ventral view, not curved; inner surface of apical region with linear mark; outer surface with longitudinal carina. Basivolsella setose, with one thick, long and basal seta; with one short spiniform process, not articulated, with wide truncate apex. Cuspis biramous. Aedeagus 2.1 × as long as wide; dorsal body of aedeagus evenly wide, narrowing progressively apicad, lateral margin straight, parallel, wholly slightly curved dorsad, apex tubercle of tergal process in dorsal view; 48–50, D. julius sp. nov., 48, metasoma in dorsal view; 49, tergal process of metasoma in dorsal view; 50, tuft of setae of tergal process in dorsal view; 51–53, D. davus sp. nov., 51, metasoma in dorsal view; 52, tergal process of metasoma in dorsal view; 53, tubercle of tergal process in dorsal view.

with one pair of outer lobe; base of dorsal body of aedeagus strongly sclerotized, triangular, with median region truncate; ventral ramus of aedeagus reaching half length of dorsal body, lateral margin straight, evenly narrow and base as narrow as apex. Apodeme not extending beyond genital ring.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Chaiyaphum: Pa Hin Ngam NP, ecotone between mix deciduous and dipterocarp forest, 15°38.132’N 101°23.922’E, 698 m, Malaise trap, 1–7.ii.2007, Katae Sa-nog & Buakaw Adnafai leg., T1643 GoogleMaps . Paratypes: THAILAND. Malaise trap, Phetchabun: Khao Kho NP, Mix deciduous, 16°39.589’N 101°8.185’E, 168 m, Somchai Chachumnan & Saink Singtong leg., 1 ♂ 19–26.i.2007, T1398 GoogleMaps , 1 ♂ 26.i–2.ii.2007, T1399 GoogleMaps . Chaiyaphum: 1 ♂ Pa Hin Ngam NP, Dry evergreen forest at waterfall, 15°34.802’N 101°25.990’E, 430 m, 16–22.xi.2006, Katae Sa-nog & Buakaw Adnafai leg., T1035 GoogleMaps .

Variations. Body length between 1.90 and 2.66 mm; LFW between 1.63 and 2.47 mm; maximum wing width between 0.72 and 0.95 mm; frontal punctures small and deep; vertex crest slightly convex; mandible with lower tooth angulate, upper and median teeth sub-angulate; clypeus with large lateral teeth; antenna short.

Remarks. Dissomphalus gionus sp. nov. is similar to D. davus sp. nov., D. hetus sp. nov. and D. paulus sp. nov. because of the following characteristics: rectangular shape of aedeagal dorsal body, ventral surface of aedeagal dorsal body long and very thick seta, and paramere almost as long as basiparamere. However, the dorsal surface of the basiparamere of D. gionus sp. nov. is much shorter than the ventral surface; the genital ring is straight, the median region has inclination angle of about 90º, the inner lobes of aedeagal dorsal body is widely visible in dorsal view; the ventral ramus is narrow and very short.

Distribution. Thailand (Chaiyaphum and Phetchabun).